Meggs wouldn't say whether his decision was a vindication for Winston, saying he would "leave that to you all after you review the facts."
He did reveal some new information, saying that while Winston's DNA was present in the sexual assault kit, the DNA of another male was also found, complicating the investigation. That person was identified as the accuser's boyfriend, and he was not associated with the complaint, Meggs said.
Meggs added that the accuser had no outward signs of trauma, a key point in trying to prove an assault, and that documents related to the case were being released.
Search warrants in the case were released before Meggs' announcement and indicate the woman told police she was raped at an apartment after a night of drinking. In the warrant, the accuser says she and friends had shots at a local bar and her "memory is very broken from that point forward."
Meggs said that toxicology reports show the accuser had a blood alcohol level of .04 and that there was no evidence of drugs, including what are commonly referred to as date rape drugs.
According to the warrants, the accuser says she remembers being in a cab with a man and going into an apartment before she was raped. Meggs said investigators could not find the cab driver, the attempt made much more difficult by the time that had elapsed before his office began investigating.
After that, the accuser said she remembers the suspect dressing her, putting her on a scooter and dropping her off at an intersection, but she had no idea where the alleged rape occurred.
"Her recall of the events of that night have been moving around quite a bit," Meggs said.
Meggs described the accuser as being as forthcoming as she could be but that she did want to protect "herself, her family, her own name," which he said is not uncommon in sexual assault investigations. The accuser's lack of recall proved to be another critical aspect in the state's decision not to move forward, Meggs said.
Meggs said he didn't think prosecutors could put the accuser on the stand and "count on her to prove elements of a crime."
After praising Meggs for his investigation, Jansen said he wished Meggs had spoken about the affidavits from witnesses who refuted the accuser's claims. He said that three other men were present in the apartment where the accuser said she was raped. When asked whether those were also football players, he said that was a "good bet."
Two of Winston's teammates backed his story in statements they gave last month to an investigator for Jansen. The statements were part of an investigative file released Thursday.
Once at the apartment, the teammates said they peeked through Winston's bedroom door and saw the woman having sex with the quarterback. At one point, Casher said, he "busted into the room to embarrass Jameis" and the woman yelled at him to "get out."
In a later interview with police, Casher changed this part of his story, saying he went into the room because he hoped the woman would also have sex with him, something he said had happened in the past when he and Winston brought a woman to the apartment.
Casher left the room and was not accused of having sex with the woman, and no other women have made accusations against Casher or Darby.